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My Mac Pro become bit slow, I installed a lot of things, I downloaded a lot of torrents but I did not find any particular problem, but I found it is better to reset all my Mac. So I went through steps prescribed on YouTube:

Shutdown Mac.

Press Command + R and power button.

I got a window contain, disk utilities, so I did erase all my Mac disk. After

I selected “Reinstall OS X”

After a couple of steps, It is asking for my Apple account user/password. I have given both. But it says “this service unavailable, please try later. ” I tried more than 20times, Same user/password I am using on my mac air also it working well.

For this issue, I find a solution online, that first login in iCloud or iTunes with Safari. After try again. I did same but no luck.

1 Answer
1

This is Apple's method of doing it and I've found it far more reliable than using Disk Maker X or any drag and drop method. For clarity if your USB stick was formatted as Untitled, the command would look like this:

Because you started the command with the word 'sudo' you will be asked to enter your user password, go ahead and do this and then wait. It can sometimes take up to an hour for this process to finish.

Next make sure have a backup before you proceed to do anything. Time Machine to a USB hard drive of equal or greater size than your hard disk will be good enough.

Once the above steps are done, restart your machine with the memory stick inserted and turn the machine on while holding the alt(option) key.

Select the Mac OS Installer and follow the instructions. If you're going for just a reinstall over the top of your existing files, simply select re-install Mac OS and let it run.

If you're going for a completely clean install (recommended if you're having issues) make sure you have backup of your system first then proceed to use Disk Utility to format your main hard drive (best practice is to call it Macintosh HD). Then go back to the installer menu and re-install Mac OS to the newly cleaned drive.

I got resolved my self with the wonderful help from one youtube clip. He shared Mac OS also that is really more helped. I have gone through a lot of youtube clips and online blogs. Everybody giving the same sort of solution. But problem nowhere I am not able to get the Mac OS that I need. That youtube clip is youtube.com/watch?v=3EczYxx7ls0&t=106s
– SunSep 9 '17 at 7:48